Kayak Wet Exit Air Supply Time Calculator
Repetitive dives require enough surface time to off-gas absorbed nitrogen before your next descent. Enter your first dive's depth and bottom time, plus your planned second dive depth, to get an estimated minimum surface interval. This is an educational estimate only — always follow your dive computer and certified dive tables.
About this calculator
Estimate the minimum surface interval needed between two dives based on depth, dive time, and nitrogen loading to help plan safer multi-dive days.
Frequently Asked Questions
Is this a substitute for dive tables or a dive computer?
No. This calculator provides a rough educational estimate only. Always use a certified dive computer or official dive tables (like the PADI Recreational Dive Planner) and follow your training agency's guidelines.
Why does surface interval matter for repetitive dives?
Your body absorbs nitrogen under pressure during a dive. Surface intervals allow your body to off-gas that nitrogen before you take on more during a subsequent dive, reducing decompression sickness risk.
What is a conservatism factor?
It's an adjustable safety margin — higher settings assume more nitrogen retention and recommend longer surface intervals, useful for cold water, exertion, or personal risk tolerance.